1. University Hospital La Paz and IdiPaz, Madrid, Spain
2. Division of Rheumatology, Inflammation and Immunity, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, USA
3. Department of Gastroenterology, Infectiology and Rheumatology (Including Nutrition Medicine), Charité – Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Hindenburgdamm 30, Berlin 12203, Germany
4. Epidemiology Unit, German Rheumatism Research Centre, Berlin, Germany